Yamada Green Dome Maebashi (ヤマダグリーンドーム前橋, Yamada Gurīn Dōmu Maebashi) is an arena in Maebashi, Japan. With a capacity of 8,000, it is primarily used for indoor sports. One of its primary functions is as a velodrome - when it is known as Maebashi Velodrome (前橋競輪場, Maebashi Keirinjyō) - holding parimutuelKeirin races throughout the year.
The Dome's velodrome oval is 335 meters in circumference. A typical keirin race of 2,035 meters consists of six laps around the course.
Green Dome Maebashi is one of only two indoor locations in Japan that offer professional keirin races - the other venue is Kokura Velodrome at the Kitakyushu Media Dome.
Maebashi's keirin identification number for betting purposes is 22# (22 sharp).